Who has been buying Woojung Bio stock?

4 distinct insiders have filed 24 disclosed insider purchases in Woojung Bio (215380), most recently on 2026-06-09. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does Woojung Bio have?

Woojung Bio has 24 buy-side and 0 sell-side disclosures on record, covering ₩211M ($147K) in total reported value, spanning 2024-06-21 to 2026-06-09.

Do insider buys in Korean stocks predict returns?

Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean regulatory filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

Woojung Bio 215380

Company

우정바이오Woojung Bio

Insiders

Buys

Total Value

₩211M ($147K)

Avg Return

+36.50%

Last Filing

2026-06-09

Woojung Bio (215380) has 24 disclosed insider purchases and 0 disclosed disposals on record, filed by 4 distinct insiders. Together those filings cover ₩211M ($147K) in reported transaction value. The earliest filing StockDrifts holds for Woojung Bio is dated 2024-06-21; the most recent is 2026-06-09. Across these filings the average return since disclosure is +36.50%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2026-06-09	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	813	₩2,465	+0.2%	₩2M ($1K)
2026-06-05	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	4.0K	₩2,465	+0.2%	₩10M ($7K)
2026-06-04	BUY	Market Buy	함석희 Seokhee Ham	Managing director treatment	400	₩2,540	-3.0%	₩1M ($706)
2026-06-04	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	2.7K	₩2,540	-3.0%	₩7M ($5K)
2026-06-02	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	2.3K	₩2,485	-0.8%	₩6M ($4K)
2026-06-02	BUY	Market Buy	함석희 Seokhee Ham	Managing director treatment	1.0K	₩2,485	-0.8%	₩2M ($2K)
2026-06-01	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	2.2K	₩2,570	-4.1%	₩6M ($4K)
2026-06-01	BUY	Market Buy	함석희 Seokhee Ham	Managing director treatment	600	₩2,570	-4.1%	₩2M ($1K)
2026-05-29	BUY	Market Buy	함석희 Seokhee Ham	Managing director treatment	3.0K	₩2,605	-5.4%	₩8M ($5K)
2026-05-29	BUY	Market Buy	이상수 Sangsu Lee	Managing Director	1.0K	₩2,605	-5.4%	₩3M ($2K)
2025-08-27	BUY	상속	천세정 cloth washing	vice president	2.1M	₩1,658	+40.8%	₩3.6B ($2.5M)
2025-08-27	BUY	상속	천희정 Cheon Hee-jeong	CEO	2.1M	₩1,658	+40.8%	₩3.5B ($2.4M)
2025-06-30	BUY	기타	천희정 Cheon Hee-jeong	CEO	2.0K	₩1,777	+31.4%	₩4M ($2K)
2025-03-28	SELL	기타	천희정 Cheon Hee-jeong	moving	-2.0K	₩1,482	-57.6%	₩3M ($2K)
2024-08-14	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	500	₩1,635	+42.8%	₩818K ($568)
2024-08-12	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	2.5K	₩1,617	+44.4%	₩4M ($3K)
2024-08-09	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	1.0K	₩1,621	+44.0%	₩2M ($1K)
2024-08-08	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	3.0K	₩1,530	+52.6%	₩5M ($3K)
2024-08-02	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	2.5K	₩1,380	+69.2%	₩3M ($2K)
2024-07-29	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	4.0K	₩1,433	+62.9%	₩6M ($4K)
2024-07-25	BUY	Market Buy	남영표 Nam Youngpyo	Managing Director	13.7K	₩1,350	+73.0%	₩18M ($13K)
2024-07-22	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	15.0K	₩1,520	+53.6%	₩23M ($16K)
2024-07-18	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	15.6K	₩1,480	+57.8%	₩23M ($16K)
2024-07-12	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	10.5K	₩1,411	+65.5%	₩15M ($10K)
2024-07-05	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	19.7K	₩1,410	+65.6%	₩28M ($19K)
2024-07-04	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	3.0K	₩1,251	+86.7%	₩4M ($3K)
2024-07-01	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	21.5K	₩1,196	+95.2%	₩26M ($18K)
2024-06-28	BUY	Market Buy	천병년 Cheon Byeong-nyeon	CEO	7.1K	₩1,237	+88.8%	₩9M ($6K)
2024-06-21	BUY	기타	남영표 Nam Youngpyo	Managing Director	5.8K	₩1,220	+91.4%	₩7M ($5K)

Frequently asked questions

Who has been buying Woojung Bio stock?: 4 distinct insiders have filed 24 disclosed insider purchases in Woojung Bio (215380), most recently on 2026-06-09. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does Woojung Bio have?: Woojung Bio has 24 buy-side and 0 sell-side disclosures on record, covering ₩211M ($147K) in total reported value, spanning 2024-06-21 to 2026-06-09.
Do insider buys in Korean stocks predict returns?: Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean regulatory filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.